US2166335A - Stereopticon slide - Google Patents

Description

July 18, 1939. M. BANNER STEREOPTICON SLIDE FiledF 7 /Z "Jr5 /5 IN VENT OR Patented July 1s, 1939 UNITED STATES PATENT oFFlcE 5 Claims.

My invention relates to stereopticon slides.

The object of my invention is to provide a stereopticon slide comprising a rotatable disc of glass or other suitable transparent material on which is printed opaque characters such as letters, 1"1gures or symbols arranged in a circle; and mounted in a frame of glass, the arrangement being such that light rays may be projected thru the disc and liframe which supports the disc in the act of projecting the characters on a screen.

- A further feature oi my invention is the use of a stationary pointer to identify the nearest character thereto when the disc is in a position of rest.

My device may be used for playing games and is adapted for use in moving picture theatres.

For instance. it may be intended to give a free 4 ticket to the holder of a lucky number such number to be determined by operation of the device, aiter giving patrons of the theatre cards with niunbers printed thereon, each card having a different number. f

By determining the winning number before the audience by use of the device. no question can be raised as to the right winner.

' The device is adapted to be placed in the usual slide holder of a stereopticon and all of the characters are projected on the screen simultaneously.

It has been customary to make slides of this character with a stationary d isc or dial and a rotating pointer to indicate a'character on the dial when it is in a position of rest.

Such a construction requires a counterbalance for the pointer to insure its even movement in spinning. and often the counterbalance extends in a line with the pointer directly across the dial so that to a person with poor sight, either end might appear as the pointer end. thus causing confusion as to number selected.

By rotating the dial instead of the pointer, no one is misled as to the number resting nearest to the pointers end, andthe dial may be perfectly balanced without dimculty.

Referring to the drawing which forms a part of this specification,

Fig. 1 is a face view of the slide, part of the iront glass plate being removed to disclose the arrangement of the glass dials or discs mounted in the frame.

Fig. 1A is a front elevational view of the dial portion and pointer.

Fig. 2 is a perspective view of the frame and disc portions shown in separated relation.

Fig. 3 is a vertical sectional side view looking in the direction indicated by the arrows in Fig, 1.

Fig. 4 is a vertical sectional side view of the pivotal portions shown in assembled relation.

Fig. 5 is a side view of the pivotal bearings comprising their respective anges byl means of which the discs are supported in operative position by 5 the frame portion of the device.

I0 indicates the front plate which serves as the supporting element for the dial and disc portions I I and I2 respectively, and I3 indicates an opaque frame which braces the front plate and renders 10 its portions outside of the circle I4 impervious to light rays.

The plate I3 is cemented to the front plate and the discs II and I2 are held together at their outer edges by a cylindrical ring of thin metal I5 15 which is spun over their outer edges as illustrated.

The front plate I0 is provided with an aperture I6 in which is closely tted a cylindrical bushing Il having a. flange I1 which rests against its outer surface as illustrated.

A pointer I8 is suspended :from the cylinder Il and rests against the rear side of the plate I0, and a cylindrical plug I9 ilts in the bushing Il with its flange I9' pressed against the-pointer to hold it in rm relation with the plate l0.

Formed integral with the plug I9 is a cylindrical bearing 20 on which is mounted the hub portions comprising the cylinder 2| with its flange 2l and cylinder 22 with its ange portion 22' and washer 23.

The disc'l2 and dial II are each provided with an aperture I2 and II respectively, thru which the cylinder 2| projects, the disc and dial being heldvrmly between the flanges 2| and 22 while the cylinders 2| and 22 are fitted in close frictional relation and are freely rotatable on the bearing 20 between the ilange I9 and the washer 23 secured to the outer end of the plug I9 on the extension 2l. 40

Iii/will be understood that the disc and dial are made of thin glass and that the parts comprising the frame are very narrow to permit the slide as a whole to t within the standard holder forming a part of the projection apparatus.

The opaque portion of the frame indicated by I3 is formed with an opening in its top to pro'l vide a space I3' to permit the dial and disc to extend above the frame so that the dial may be manually rotated, and also that the characters carried by the dial are located between the disc and dial plate where they are protected from contact with the hand in handling the slide and from abrasion in operation and in shipping etc.

The hand of the pointer is made very thin so 2 that no shadow will be cest on the dial and magniiied on the screen in the act of using the device.

Itwillalsobenotedthatbyreasonoithe pointer being stationary. it need not necessarily be suspended from the hub of the wheel but could.v

be placed in any desired position on the inner or outer side of the iront plate il so long as the pointer intersects the circular line of travel of the dial to indicate a character when the .dial is at i1 or the parts being made of durable material insures good service.

Having thus described-my invention I claim as new:

l. A stereopticon slide of the character described comprising an opaque frame formed with a circular opening which extends thru the upper side of the frame, a plate of transparent material carried by said frame, means carried by `said plate for supporting a pair of discs, a pair oi discs rotatably mounted on said means one of` the upper side oi material located in and extending thru the upper side oi' said opening one ot which comprises a dial and each o! which is provided with a central aperture, and means carried by said Plate and extending thru said apertures to support said discs in rotatable relation.

3. The construction dened in claim 2, together with; and a metal band encircling the periphery of said discs.

4. A stereopticon slide of the character described comprising an opaque frame formed with a central opening which extends thru the upper side thereof, a plate of transparent material extending over the face o! the frame and secured thereto. a pair of transparent discs rotatably mounted in said opening in the frame and extending thereabove one of which comprises a dial lo' cated between them, means for holding said discs in close contact with each other, and a stationary pointer located adjacent the dial to indicate a symbol thereof when the dial is at rest.

5. A stereopticon slide of the character described comprising an opaque frame formed with a circular opening which extends thru the upper side of the frame, a plate oi transparent material carried by the frame, means carried by said plate for supporting a pair oi' discs extending above the frame and a pair of discs rotatably mounted on said means one of which discs comprises a dial located between them, means for holding said discs together to insure their rotation in unison, andA means for indicating a character on the dial when it is at rest.

MURRAY BANNER.

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